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Reporting the mass of your uncut rubbers |
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hleett 
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 Posted: 12/31/2018 at 7:19pm |
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Here is my attempt to figure out the area of the most common blade size of 15.7x15.0cm. These blades include BTY TBS, Amultart, Schlager Carbon, Timo Boll, ZJK, MJ ALC/ZLC/ZLF/T5000/W7, Viscaria etc....and quite a few other popular brands as well. Since 15.7x15.0 is not a perfect circle I am taking the average of these 2 numbers of 15.35cm diameter, 1/2 that for radius of 7.675cm. Since Area= π r2 we have Area = (3.14159) x (7.675 x 7.675) Area is 185 square cm. Now multiply this number by your rubber's Gram/Sq cm and figure it's weight.
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igorponger
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Posted: 01/01/2019 at 6:34pm |
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A PIECE OF WISDOM.
How do I know effective Playing Area of my racket blade wirh a high accuracy up to 0.1 square cm. My best preffered method to find the playing area is as follows. Materials needed -- A pair of scissors -- Sheet of a smooth cardboar A4 size (my usual choice those pictorial cellulose dustcover to wrap Vynil diskus) -- Digital scales reading to 0.01 gramme 1. Cary over the blade's outer shape onto the cardboard sheet and cut the figure out. Weigh up the Figure (FW). 2. Cut off a square sample 10 x 10cm from the figure and weigh up the Sample (SW) 3. The Playing Area (Figure Area) = WF *100 / SW cm2 Be Happy. PS// Through applying this procedure on many different rackets, I did found out that effective playing surface on most regular blades proved to be in the range of 200 -- 203 cm2. Edited by igorponger - 01/02/2019 at 8:31am |
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stiltt
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Posted: 01/02/2019 at 1:26am |
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I found 195 in an old thread. also the 72/28 average seems good for the typical 169mmx169mm rubber and a 157x150 blade: a rubber that's 71 gr uncut will be about 0.72x71g= about 51g.
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igorponger
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Posted: 01/03/2019 at 3:16am |
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Digital Scales is the very praised havings, indeed
 A time ago, I had got to calculate effective playing area on those fancy shapes, in exact numbers to 0.1 decimal.   Thankfully, I was able to make the very best use of my digital balance, to my very best satisfaction. Educated mind is a great attainment, indeed. |
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igorponger
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Posted: 01/03/2019 at 4:18am |
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Hi, Simas Just to proven the power of arithmetics. I can instantly tell you the very exact cut weight on this rubber without making any physical reduction of the rubber sheet. It is kinda like a magical prophecy, indeed. Let's go ..... 53 / 16.6 x 16.6 = 0.192 g/cm2 Specific Weight of the Rubber 0.192 x 200 = 38 grammes Cut weight estimated So, you can now safely expect your present rubber sheet of AK47 to go reduced to 38 grammes after trimming.  Please let me know if my prediction meets the factual weight after trimming on the rubber.  Edited by igorponger - 01/03/2019 at 4:49am |
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Simas
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Posted: 01/05/2019 at 7:02am |
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Nice. But can't do that. The rubber is glued for some time now on my spare setup. When I peel it, if I won't forget, I will :)
Edited by Simas - 01/05/2019 at 7:03am |
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Stiga Offensive Classic Legend
DHS Hurricane Neo3 Donic Bluefire JP01 Turbo |
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piligrim
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Posted: 01/05/2019 at 7:22am |
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I have this rubber. it weight 42g cut for regular size blade |
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igorponger
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Posted: 01/05/2019 at 2:21pm |
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Still waiting for Simas response ....
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igorponger
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Posted: 01/05/2019 at 3:03pm |
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There is nothing wrong about the rubber. AK47 RED , high density sponge, 56 gramme uncut sheet (as owned by Piligrim ) AK47 BLUE, low density sponge, 53 gramme uncut (as owned by Simas). 47 BLUE ultra light sponge, it feels much like squirell feather, indeed. |
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haggisv
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Posted: 01/06/2019 at 6:53pm |
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If all blades were the same shape and size, we could easily use the same formula... but unfortunately blade shapes and sizes vary significantly. |
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hleett
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Posted: 01/06/2019 at 8:37pm |
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The formula is the same, just have to figure out the blade area plug in the G/(cm)(cm) values of your rubber. You don't have to be a rocket scientist to figure that out.
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AndySmith
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Posted: 01/19/2019 at 9:17am |
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Brand: Xiom
Rubber ID/Model: Omega 7 Pro Thickness: Max Colour: Red Uncut Mass: 68.15g Length: 169 Width: 169 Brand: Xiom Rubber ID/Model: Omega 7 Pro Thickness: Max Colour: Black Uncut Mass: 66.82g Length: 169 Width: 169 Brand: 729 Rubber ID/Model: Bloom Arc H45 Thickness: 2.2 Colour: Black Uncut Mass: 61.31g Length: 163 Width: 163 Brand: 729
Rubber ID/Model: Bloom Spin H45 Thickness: 2.2 Colour: Black Uncut Mass: 66.76g Length: 163 Width: 163 |
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This was a great signature until I realised it was overrated.
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pitigoi
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Posted: 01/28/2019 at 6:49pm |
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Brand: Yinhe
Rubber ID/Model: Mercury II medium-sponge Thickness: max Colour: red Uncut Mass: 63g Length: 169 Width: 165 density guess: 0.226 Brand: Adidas Rubber ID/Model: Blaze Spin Thickness: Max Colour: black Uncut Mass: 51g Length: 169 Width: 169 density guess: .179 (not legal in tournaments anymore) Brand: Xiom Rubber ID/Model: Vega Europe Thickness: Max Colour: red Uncut Mass: 60g Length: 168 Width: 169 density guess: 0.211 |
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obesechopper
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Posted: 01/31/2019 at 5:32pm |
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stiga horizontal 20 long pips
1.4-1.7 sponge in red 30 grams uncut
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Sedis
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Posted: 02/02/2019 at 5:02am |
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Brand: Stiga
Rubber ID/Model: Airoc Astro S Thickness: 2.1 Colour: Red Uncut Mass: 64g Length: 168 Width: 168 Measured sponge hardness: 42° Shore O
Edited by Sedis - 02/02/2019 at 5:05am |
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Dream1700
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Posted: 02/04/2019 at 1:47pm |
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Brand: Butterfly
Rubber ID/Model: Rozena Thickness: 1.9 Color: Black Uncut Mass: 66.5 Length: 180 Width: 167 |
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igorponger
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Posted: 02/05/2019 at 4:17pm |
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Hi, Sedis It's great to obtain the Sponge Hardness actual numbers from tester's hand directly.. . So kind of you, indeed. Yes, we need all the tribology data of each rubber present on LARC list. Your given measurements of sponge hardness is of real value. Yes, we'll gladly incorporate your every information into our Big Rubber Hardness Chart and the Big Sheet Of Rubber Mass as well. THANKS YOU again, a lot. https://tabletennis-reviews.com/reference/sponge-hardness-table/ |
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AndySmith
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Posted: 02/08/2019 at 5:19am |
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Brand: Joola
Rubber ID/Model: Golden Tango PS Thickness: Max Colour: Black Uncut Mass: 73.20g Length: 169 Width: 169 Brand: Andro Rubber ID/Model: Rasanter V47 Thickness: 2.0mm Colour: Red Uncut Mass: 67.74g Length: 169 Width: 169 |
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This was a great signature until I realised it was overrated.
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Sedis
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Posted: 02/08/2019 at 5:40am |
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No problem - I purchased a durometer after borrowing one and finding it really useful, I will include my results with any future weight submissions.
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Sedis
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Posted: 02/18/2019 at 1:46pm |
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Brand: Tibhar
Rubber ID/Model: Hybrid K1 Pro Thickness: Max Colour: Black Uncut Mass: 71g Length: 170 Width: 169 Measured sponge hardness: 54° Shore O
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vanjr
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Posted: 02/25/2019 at 9:35am |
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Brand: Andro
Rubber ID/Model: rasanter R42 Thickness: max Colour: Black Uncut Mass: 67.1 g Length: 171 (from handle to tip) mm Width: 170 mm Brand: Spinlord Rubber ID/Model: Gigant Thickness: 1.2 Colour: Red Uncut Mass: 35.6 g Length: 177 mm Width: 176 mm Brand: Dermaterialspezialist
Rubber ID/Model: Reflection Thickness: 1.2 Colour: Red Uncut Mass: 35.6 g Length: 170 mm Width: 171 mm |
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Dream1700
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Posted: 02/27/2019 at 3:34pm |
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Brand: Andro
Rubber ID/Model: Rasanter V47 Thickness: 1.7 Color: Red Uncut Mass: 65.8 Length: 170 Width: 168 |
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hleett
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Posted: 03/09/2019 at 6:59pm |
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Brand: Xiom
Rubber ID/Model: Omega VII Pro Thickness: 2.0 Colour: Black Uncut Mass: 63.5g Length: 170mm Width: 170mm Density: 0.2197
Edited by hleett - 03/10/2019 at 12:27pm |
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vanjr
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Posted: 03/12/2019 at 8:58am |
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Brand: 729 (friendship
Rubber ID/Model: 729-08 ES Thickness: 2.1 Color: black Uncut Mass: 61.6 g Length: 164 Width: 167 sponge 45 degree
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pitigoi
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Posted: 04/05/2019 at 5:09pm |
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Brand: RITC/Friendship/729
Rubber ID/Model: Dr. Evil Thickness: OX Colour: red Uncut Mass: 22g Length: 168mm Width: 174mm density guess: 0.075 Brand: Palio Rubber ID/Model: CK531A (blue package) Thickness: 06-0.8 mm Colour: black Uncut Mass: 37g Length: 165 Width: 163 density guess: 0.137 Brand: 729 RITC Rubber ID/Model: Legend 105 Thickness: 1.9mm Colour: red Uncut Mass: 48g Length: 163mm Width: 163mm density guess: 0.181 |
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Right hand: Stiga Allround NCT (74g) /Rasant Grip max/Talon OX red (total 135g)
Left hand: Stiga Allround WRB (71g)/Vega Europe max/Innova Ultra Light max (total 153g) Fitness Friendship Fun |
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AndySmith
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Posted: 04/11/2019 at 9:24am |
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Brand: Butterfly
Rubber ID/Model: Dignics 05 Thickness: 2.1 Colour: Red Uncut Mass: 70.21g Length: 180 Width: 168 |
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This was a great signature until I realised it was overrated.
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Sedis
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Posted: 04/20/2019 at 2:27am |
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Brand: Gambler
Rubber ID/Model: Reflectoid Thickness: 1.5mm Colour: Black Uncut Mass: 45g Length: 166 Width: 166 Measured sponge hardness: 44° Shore O Brand: Gambler
Rubber ID/Model: Reflectoid Thickness: 1.5mm Colour:Red Uncut Mass: 46g Length: 166 Width: 166 Measured sponge hardness: 45° Shore O |
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haggisv
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Posted: 04/20/2019 at 7:38am |
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Database updated up to this point, a massive number added, thanks everyone for posting!
Edited by haggisv - 04/20/2019 at 7:40am |
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vanjr
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Posted: 04/22/2019 at 10:13am |
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Brand: Gambler
Rubber ID/Model: 7S Thickness: 2.1 Color: red Uncut Mass: 59.9 g Length: 163 Width: 163 sponge hardness: na Brand: Gambler
Rubber ID/Model: Mechtek Thickness: 1.9 Color: red Uncut Mass: 61.5 g Length: 163 Width: 163 sponge hardness: na Brand: Gambler Rubber ID/Model: Mechtek Thickness: 1.5 Color: red Uncut Mass: 55.8 g Length: 164 Width: 163 sponge hardness: na |
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Hans Regenkurt
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Posted: 05/09/2019 at 11:57am |
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Brand: 729 / Friendship
Rubber ID/Model: Presto Spin 46 MAX Thickness: 2.15 Colour: Black Uncut Mass: 67g Length: 170 Width: 165 density estimate: 0.23 gr / cm2 Brand: 729 / Friendship Rubber ID/Model: Presto Speed 46 MAX Thickness: 2.15 Colour: Red Uncut Mass: 68g Length: 165 Width: 165 Density estimate: 0.24 gr/cm2 Brand: Tibhar Rubber ID/Model: MXP Hard 50 Thickness: 2.1 Colour: Red Uncut Mass: 76g Length: 169 Width: 179 Density estimate: 0.25 gr/cm2 I have bought a black one and it weighs 78 gramms uncut.
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Simas wrote: